After I receive messages, older messages disappear from my Inbox
When email sync takes place, by default, the last three days' worth of email messages is downloaded from your mail server to your Inbox. All messages older than three days are removed from your Inbox; they are not deleted on the server, however.
You can change the setting to download only one or two days' worth of messages. If you select one of these options, any messages older than one or two days are deleted from your Inbox. You can also change the setting to download all messages regardless of the date, in which case all messages continue to appear in your Inbox (see Enter advanced account settings).
I have trouble sending or receiving attachments
•Email attachments smaller than 150 KB are downloaded automatically. All other attachments have to be downloaded manually by tapping the attachment name in the email. You may need to tap the attachment to complete receiving it.
•Sometimes an attachment to an email may prevent the email from being sent. The reason may be related to the account, an account setting or the file. To determine whether this is the case, try sending the email without the attachment or try sending the email from a different email account. If a different account works, check the settings of the problem account. If sending the email without the attachment works, also check the account settings, and try sending the email with another file, in case the first file was damaged.
Messaging
I can't send or receive text or multimedia messages
•Make sure that the phone is on (see Turn wireless services off (aeroplane mode)).
•For multimedia messages, do the following:
•Contact your wireless service provider to verify that your plan includes messaging services, that these services have been correctly activated on your smartphone and that they are available at your location. (Your wireless service provider should be able to tell you if messaging services have been experiencing transmission delays.)
•Turn off the phone by turning on aeroplane mode, and then turn off aeroplane mode (see Turn wireless services off (aeroplane mode)).
•Restart your smartphone (see Restart your smartphone).
•Make sure you are in an area with good signal strength (see Signal strength is weak).
•Make sure you have a data connection over your wireless service provider’s network. Note that you cannot send or receive multimedia messages over a
•Check to see if you have data services enabled. Open Phone 
, open the application menu and tap Preference & Accounts. Under Network, make sure Data Usage is set to On.
•If you are in roaming coverage, check to see if you have data
roaming enabled. Open Phone 
, open the application menu and tap Preferences & Accounts. Under Network, tap Data Roaming and tap Enabled.
•Make sure the file you are attaching or receiving is of a supported file type (see Create and send a text or multimedia message or Receive and view text and multimedia messages).
•Some wireless service providers have limits on the size of attachments to multimedia
video you want to attach: Open Videos 
and tap Video roll. Videos are listed by date and time, with the length and size of the video. To check the size of a photo you want to attach: Put the smartphone in USB Drive mode, navigate on the computer to the DCIM/100PALM folder, and check the size of the photo (see Copy files and folders using USB Drive mode for information on using USB Drive mode).
•You may need to manually enter your MMS APN settings. Check with your wireless service provider to obtain these settings (see Manually select network settings).
202 Chapter 14 : Troubleshooting